Two pics-sick plants-leaves curling, turn grey, die

My plants were doing pretty well. They are clones. They were very branchy but skinny stems/branches, and are now about 12" tall. They started to turn a lighter shade green first, then leaves started curling at the tips which i thought was from spraying with water occassionally so i stopped, leaves keep getting worse. New growth starts but then leaves die when they are 1-2" long. I topped both of these around 8". THey are under a 200 watt cfl. ANy suggestions greatly appreciated. I re-potted the sicker one to check roots out-lots, filling pot-maybe root bound?????

What are you feeding them, at what PH? How often, dosage, how old are the plants?

Mongobud said:

What are you feeding them, at what PH? How often, dosage, how old are the plants?

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Plants a couple months maybe grown up from clones-don't always keep track, move to flower room based on size. pH about 6, feed every second batch of water with raingrow 4-2-3 organic fertilizer 1/2 to full strength. Water based on moisture meter reading normally, but did add a bunch of pH 6 water to try to flush recently. The plants were looking like this before flush and have gotten worse since. Use promix HP soil. Sorry was in a hurry to post pics this AM and didn't have time to give details. Any help greatly appreciated. Never had this problem with grown plants, but these ones are super branchy compared to others I have grown out.

I wish I could help you out better bro but I'm not familiar with that soil or fert.

How well did you flush? Those look like big pots, and if not flushed properly it could release more nutes to the plant locking up certain nutrients and causing toxicity in others.

My guesses: 1.) nute burn 2.) Potassium toxicity 3.) Heat stress 4.) something PH related which could cause number 2

Did you test the PH of the runoff?

Maybe someone else can help better than I could

Mongobud said:

I wish I could help you out better bro but I'm not familiar with that soil or fert.

How well did you flush? Those look like big pots, and if not flushed properly it could release more nutes to the plant locking up certain nutrients and causing toxicity in others.

My guesses: 1.) nute burn 2.) Potassium toxicity 3.) Heat stress 4.) something PH related which could cause number 2

Did you test the PH of the runoff?

Maybe someone else can help better than I could

Click to expand...

Thanks. THe cfl is far enough away that there is no heat issues-about 70 to 80 degF and all my other plants have been fine. I don't have anything to test my soil pH so don't know about pH from runoff. If it is nute burn as it looks like could be should I just flood the pots with water to flush out nutes???? Definitely something toxic getting to them to kill the leaves off so quickly. The soil is from the hydro store and I have used a few bales that worked great actually compared to sunshine #4 as some reccommend.

If you're in a 1 gallon pot, flush with 3 gallons of distilled water...I wouldn't just dump it in there....your hydro shop should have PH testers, either digital or the drop test...don't get the strips they suck.